All animals need to eat _____to get _____ to live. But in order to be useful to the body, the food has to be broken down through a process called_____. So, all animals have a group of connected organs which constitute the _____. In humans, the process of digestion begins in the ______where food is ______into small pieces by the teeth. The _____ in the mouth secretes saliva which contains an enzyme called _____. This enzyme changes _____ to sugar. Once the food is swallowed, it passes through the ______. After reaching the stomach, the food is mixed with digestive juices and is further churned. The digestive juices contain an enzyme called ______. It changes proteins into _____. From the stomach, the food goes to the ______. The small intestine releases intestinal juice. It has four enzymes called ______, _____, _____, and _____. The remaining matter goes into the ______ where the excess of _____ is absorbed. The remaining waste is called _____ and it is pushed into the ______ where it waits before leaving the body through the ______.